How do we investigate when a robot causes an accident?

Robots are featuring more and more in our daily lives. They can be incredibly useful (bionic limbs, robotic lawnmowers, or the robots that deliver meals to people in quarantine), or merely entertaining (robotic dogs, dancing toys, and acrobatic drones). Imagination is perhaps the only limit to what robots will be able to do in the future. What happens, though, when robots don't do what we want them to – or do it in a way that causes harm? For example, what happens if a bionic arm is involved in a driving accident?